Chair.



G. M. KAISER & C. ADLER.

CHAIR. APPLICATIQN FILED MAY 8. 191a.

Patented Dec. 3, 1918.

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ATTORNEY G. M. KAISER 8: C. ADLER.

CHAIR. APPLICATION FILED MAY 3. I916.

Patented Dec. 3, 1918.

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ATTORNEY ens MAJOR KAISER Ann cnannivcn ADLER, or NEW YonK, N. Y. i ll vCHAIR.

" Application filedMay 8, 1916. Serial No.96,001.

To all whom it may concern:

Be it known that we, Gus MAJOR KAISER and CLARENCE ADLER, both citizensof the United States, residing in the boroughof Manhattan, city, county,and State of New York, have invented certain new and useful Improvementsin Chairs, of which the following is a full, clear, and concisedescription. 1

The present invention relates generally to improvements in chairsandismore particularly directed to the provision of a chair,

wherein the seat is adjustable to accommodate persons of differentstature, my lnvention thereby being especially adaptable to therequirements of pianists, organists and other musicians, typists, clerksand other office employees.

The primary object of this invention is to provide a chair of the typeheretofore referred to, which will be absolutely rigid in constructionand will have an adjustable seat, which may be instantly raised orlowered to any desired position by a single operation.

A further object of the present invention is to produce a chair of thecharacter set forth which may be economically produced and will have butfew operating parts so constructed and arranged as to provide astructure wherein the necessity for adjustments and repairs will beobviated and a highly durable and efiicient device produced.

Our invention also comprehends means for automatically locking the seatin any desired position, which means are capable of manual operation tounlock the seat for movement in an upward or downward direction. y 1

Other objects and advantages of the emand arrangements of parts, anddetails of operation, to which we may be entitled under our invention inits broadest aspect.

We shall now proceed to describe our invention with reference to theaccompanying drawings and then point out with more particularity theessential elements of novelty therein in the appended claim.

Patented Dec. 3, 1918..

Fig. 5 is an enlarged fragmentary detail view, showing themethod ofattaching the supporting standard to the chair seat.

Referring now to the drawin s indetail, in which like characters ofreference are employed to designate similar parts throughout the severalviews, 7 1 represents the chair frame havingthe upright back 8, the siderungs 9 and cross-rungs 10 and 11 fastened to and reinforcing the legs12 in the well-known manner.

The seat 16 of thechair may be of any a desired shape, such,forinstance, as shown in Figs. 1 and2, and is supported preferably byfour spirallythreaded standards or high pitch screws 20, the forwardpair of which are housed or inclosed in the front legs of the chair, asshown in Figs. 1 and 3, each of the legs being provided with a thimble14 which is seated in a bore therein.

The rear standards or supports 20 are contained within the preferablycylindrical housings 14:, which'may be made of metal,

wood or any other suitable material and extend from the frame? of thechair to the adjacent side rungs 9 thereof, the lower ends of thesehousings being heldin fixed or rigid engagement with the rungs by meansof the clamping plates or'members 9*. It is obvious that othermethodsmay be employed in fastening the housings to the chair rungs and thechair frame and that the forward pair of standards inlieu of beinghoused within the front legs of the chair may be contained or inclosedwithin housings similar to those indicated at 14, positioned behind thefront legs of the chair. Adjacent to each corner of the seat 16, wesecure to the under-surface thereof, by means of screws or the like 18,a plate 17 apertured at 17 to form a bearing for the pin 20*, thecontiguous portion of the seat being recessed for the reception of thehead 20 of said pin. (See Fig. 5).

As will be observed, the upper end of each of the standards or supports20 is contracted to form a shoulder on which is mounted a sprocket wheel21, this sprocket wheel being keyed to the standard by means of a transversely extending pin 20 which passes through both the sprocket and theshoulder of the support and also through the shank of the pin 20 seatedWithin the central bore provided in the shoulder, said sprocket, supportand the pin 20 being thereby rigidly locked together and renderedcapable of movement as an integral piece.

The teeth of the sprocket 21 are adapted to register or mesh with thelinks in a con tinuous chain 22, this chain, as will be apparent fromFig. 2 of the drawings, passing through the rectangular guideways 25positioned at each side of the seat and around all four sprocket wheels,being rendered invisible by the downwardly projecting flange 23 forminga part of the seat 16 (see Figs. 1 and 3).

It will be manifest from the description of our invention thus fargiven, that upon a person grasping the sides of the seat 16 and exertingan upward pull thereon the standards or supports 20 will be caused torotate by the meshing of the spiral threads thereon with thecomplemental threads on the inner wall of the fixed sockets 2 1,communicating with the upper ends of the housings 14 and 1 1 (see Fig.3) the revolution of the standards being positively timed orsynchronized by the chain 22 traveling on the respective sprockets 21.This arrangement not only insures the raising of the seat in a truehorizontal plane, but also prevents jamming of the standards in theirsockets and results in an equal distribution of the power applied to theraising or lowering of the seat, so that a force applied to any portionof the seat will cause synchronous rotation of the high pitch screws.

hen the seat is 'in the desired position, it is obvious that means mustbe provided to lock it therein and for this purpose, we have found itexpedient to form a locking means consisting of a plate 25 formed ofmetal or any other suitable material, having a downwardly extending gripor handle 26. This plate 25 is mounted to slide within a slot formed byrecesses in each of the side flanges 23, cooperating with the undersideof the seat 16, as clearly shown in Fig. 3, and carries at its inner enda downwardly extending enlarged portion 27 provided with a plurality ofpreferably cylindrical pins 28. "Extending from the opposite side of thepin bearing portion 27 of the plate 25 is a guide rod 29 having abearing in the eyelet 30 screwed home in the underside of the seat 16(see Fig; 3). A spring 81 is mounted upon this guide rod 29, one end ofthe spring bearing against the eyelet 30, the other end thereof abuttingagainst the portion 27 of the plate 25.

With this construction, it will be clearly apparent that the tension ofthe spring 31 will normally be exerted to force the plate in a directionoutwardly relatively to the chair, so that the pin 28 on the enlargedportion 27 will enter the contiguous links 22 of the chain 22, as shownin Fig. 2, thus positively locking the chain against movement andthereby preventing the further revolution of the standards or supports20. To adjust the seat, the pins 28 are disengaged from the links bypressing the plate 25, through the medium of the handle or grip 26,inwardly relatively to the seat of the chair against the tension of thespring 31. This releases the chain held in the guideway 25 and the seatmay then be raised or lowered in the manner heretofore described. Whenthe desired position has been secured the plates are released and thepins 28 engage the links 22*.

While we have described our invention with particular reference to itsapplication to a chair, which is especially suitable to the requirementof musicians and others, it will be seen that our invention issusceptible to incorporation in tables, surgical chairs, beds, cots andvarious articles of utility wherein it is desired to render one portionthereof adjustable relatively to another.

Having thus described our invention what we claim as new and desire tosecure by Letters Patent is:

In combination with a chair frame, a seat,

a plurality of high pitch screws carried by said seat and cooperatingelements on said frame, sprocket wheels on said screws, a synchronizingchain cooperating with said sprocket wheels, and locking means engagingsaid chain, whereby upon release of the locking means a force applied toany portion of the seat will cause synchronous rotation of said screws.

GUS MAJOR KAISER.

CLARENCE ADLER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Yatents,

' Washington, D. O.

